The math apparatus developed by Einstein and his controllers to fool the masses, was impressive and even if the Einstein’s Field Equations per se are ridiculous, the math apparatus includes a mathematical method to learn the curvature of a surface. The method (explained in the video segment below), is based on parallel-translation of a vector around a curve of the surface examined. I recommend watching from start if you you want a crash course in tensor math.  

https://youtu.be/foRPKAKZWx8?t=4353 …